src/include/cbmem.h

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2009 coresystems GmbH
   5  * Copyright (C) 2013 Google, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #ifndef _CBMEM_H_
  18 #define _CBMEM_H_
  19
  20 #include <commonlib/cbmem_id.h>
  21 #include <rules.h>
  22 #include <stddef.h>
  23 #include <stdint.h>
  24 #include <boot/coreboot_tables.h>
  25
  26 #define CBMEM_FSP_HOB_PTR       0x614
  27
  28 struct cbmem_entry;
  29
  30 /*
  31  * The dynamic cbmem infrastructure allows for growing cbmem dynamically as
  32  * things are added. It requires an external function, cbmem_top(), to be
  33  * implemented by the board or chipset to define the upper address where
  34  * cbmem lives. This address is required to be a 32-bit address. Additionally,
  35  * the address needs to be consistent in both romstage and ramstage.  The
  36  * dynamic cbmem infrastructure allocates new regions below the last allocated
  37  * region. Regions are defined by a cbmem_entry struct that is opaque. Regions
  38  * may be removed, but the last one added is the only that can be removed.
  39  */
  40
  41 #define DYN_CBMEM_ALIGN_SIZE (4096)
  42 #define CBMEM_ROOT_SIZE      DYN_CBMEM_ALIGN_SIZE
  43
  44 /* The root region is at least DYN_CBMEM_ALIGN_SIZE . */
  45 #define CBMEM_ROOT_MIN_SIZE DYN_CBMEM_ALIGN_SIZE
  46 #define CBMEM_LG_ALIGN CBMEM_ROOT_MIN_SIZE
  47
  48 /* Small allocation parameters. */
  49 #define CBMEM_SM_ROOT_SIZE 1024
  50 #define CBMEM_SM_ALIGN 32
  51
  52 /* Determine the size for CBMEM root and the small allocations */
  53 static inline size_t cbmem_overhead_size(void)
  54 {
  55         return 2 * CBMEM_ROOT_MIN_SIZE;
  56 }
  57
  58 /* By default cbmem is attempted to be recovered. Returns 0 if cbmem was
  59  * recovered or 1 if cbmem had to be reinitialized. */
  60 int cbmem_initialize(void);
  61 int cbmem_initialize_id_size(u32 id, u64 size);
  62
  63 /* Initialize cbmem to be empty. */
  64 void cbmem_initialize_empty(void);
  65 void cbmem_initialize_empty_id_size(u32 id, u64 size);
  66
  67 /* Optional hook for platforms to initialize cbmem_top() value. When employed
  68  * it's called a single time during boot at cbmem initialization/recovery
  69  * time. */
  70 void cbmem_top_init(void);
  71
  72 /* Return the top address for dynamic cbmem. The address returned needs to
  73  * be consistent across romstage and ramstage, and it is required to be
  74  * below 4GiB.
  75  * x86 boards or chipsets must return NULL before the cbmem backing store has
  76  * been initialized. */
  77 void *cbmem_top(void);
  78
  79 /* Add a cbmem entry of a given size and id. These return NULL on failure. The
  80  * add function performs a find first and do not check against the original
  81  * size. */
  82 const struct cbmem_entry *cbmem_entry_add(u32 id, u64 size);
  83
  84 /* Find a cbmem entry of a given id. These return NULL on failure. */
  85 const struct cbmem_entry *cbmem_entry_find(u32 id);
  86
  87 /* Remove a region defined by a cbmem_entry. Returns 0 on success, < 0 on
  88  * error. Note: A cbmem_entry cannot be removed unless it was the last one
  89  * added. */
  90 int cbmem_entry_remove(const struct cbmem_entry *entry);
  91
  92 /* cbmem_entry accessors to get pointer and size of a cbmem_entry. */
  93 void *cbmem_entry_start(const struct cbmem_entry *entry);
  94 u64 cbmem_entry_size(const struct cbmem_entry *entry);
  95
  96 /* Returns 0 if old cbmem was recovered. Recovery is only attempted if
  97  * s3resume is non-zero. */
  98 int cbmem_recovery(int s3resume);
  99 /* Add a cbmem entry of a given size and id. These return NULL on failure. The
 100  * add function performs a find first and do not check against the original
 101  * size. */
 102 void *cbmem_add(u32 id, u64 size);
 103 /* Find a cbmem entry of a given id. These return NULL on failure. */
 104 void *cbmem_find(u32 id);
 105
 106 /* Indicate to each hook if cbmem is being recovered or not. */
 107 typedef void (* const cbmem_init_hook_t)(int is_recovery);
 108 void cbmem_run_init_hooks(int is_recovery);
 109 void cbmem_fail_resume(void);
 110
 111 /* Ramstage only functions. */
 112 /* Add the cbmem memory used to the memory map at boot. */
 113 void cbmem_add_bootmem(void);
 114 /* Return the cbmem memory used */
 115 void cbmem_get_region(void **baseptr, size_t *size);
 116 void cbmem_list(void);
 117 void cbmem_add_records_to_cbtable(struct lb_header *header);
 118
 119 #if ENV_RAMSTAGE
 120 #define ROMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 121         static cbmem_init_hook_t init_fn_ ## _unused_ = init_fn_;
 122 #define RAMSTAGE_CBMEM_INIT_HOOK(init_fn_) \
 123         static cbmem_init_hook_t init_fn_ ## _ptr_ __attribute__((used, \
 124         section(".rodata.cbmem_init_hooks"))) = init_fn_;
 125 #define POSTCAR_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 126         static cbmem_init_hook_t init_fn_ ## _unused2_ = init_fn_;
 127 #elif ENV_ROMSTAGE
 128 #define ROMSTAGE_CBMEM_INIT_HOOK(init_fn_) \
 129         static cbmem_init_hook_t init_fn_ ## _ptr_ __attribute__((used, \
 130         section(".rodata.cbmem_init_hooks"))) = init_fn_;
 131 #define RAMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 132         static cbmem_init_hook_t init_fn_ ## _unused_ = init_fn_;
 133 #define POSTCAR_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 134         static cbmem_init_hook_t init_fn_ ## _unused2_ = init_fn_;
 135 #elif ENV_POSTCAR
 136 #define ROMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 137         static cbmem_init_hook_t init_fn_ ## _unused2_ = init_fn_;
 138 #define RAMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 139         static cbmem_init_hook_t init_fn_ ## _unused_ = init_fn_;
 140 #define POSTCAR_CBMEM_INIT_HOOK(init_fn_) \
 141         static cbmem_init_hook_t init_fn_ ## _ptr_ __attribute__((used, \
 142         section(".rodata.cbmem_init_hooks"))) = init_fn_;
 143 #else
 144 #define ROMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 145         static cbmem_init_hook_t init_fn_ ## _unused_ = init_fn_;
 146 #define RAMSTAGE_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 147         static cbmem_init_hook_t init_fn_ ## _unused2_ = init_fn_;
 148 #define POSTCAR_CBMEM_INIT_HOOK(init_fn_) __attribute__((unused)) \
 149         static cbmem_init_hook_t init_fn_ ## _unused3_ = init_fn_;
 150 #endif /* ENV_RAMSTAGE */
 151
 152
 153 /* Any new chipset and board must implement cbmem_top() for both
 154  * romstage and ramstage to support early features like COLLECT_TIMESTAMPS
 155  * and CBMEM_CONSOLE. Sometimes it is necessary to have cbmem_top()
 156  * value stored in nvram to enable early recovery on S3 path.
 157  */
 158 #if IS_ENABLED(CONFIG_ARCH_X86)
 159 void backup_top_of_low_cacheable(uintptr_t ramtop);
 160 uintptr_t restore_top_of_low_cacheable(void);
 161 #endif
 162
 163 /*
 164  * Returns 0 for the stages where we know that cbmem does not come online.
 165  * Even if this function returns 1 for romstage, depending upon the point in
 166  * bootup, cbmem might not actually be online.
 167  */
 168 static inline int cbmem_possibly_online(void)
 169 {
 170         if (ENV_BOOTBLOCK)
 171                 return 0;
 172
 173         if (ENV_VERSTAGE && IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK))
 174                 return 0;
 175
 176         return 1;
 177 }
 178
 179 #endif /* _CBMEM_H_ */